joker97: Not easy to make a 12-24mm work on a full frame eh (I'm only guessing the lens didn't peek at the exif)
I used to have a Sigma 10-20mm when I had a 30D, so tried the 12-24mm when I moved to full frame, but -it was soft in the corners, so I swapped it for a Canon 17-40mm f4. Not my best lens, but perfectly usable.

















